Glucose conversion into, selective

All ruthenium catalysts showed a high selectivity to D-sorbitol (>98%). The main by-product at total conversion was D-mannitol (maximum 2%), formed because a fraction of D-glucose isomerized into D-fructose, which was subsequently hydrogenated into D-sorbitol and D-mannitol. The catalytic hydrogenation... 

There are several examples of one-pot reactions with bifunctional catalysts. Thus, using a bifunctional Ru/HY catalyst, water solutions of corn starch (25 wt.%) have been hydrolyzed on acidic sites of the Y-type zeolite, and glucose formed transiently was hydrogenated on ruthenium to a mixture of sorbitol (96%), mannitol (1%), and xylitol (2%) [68]. Similarly a one-pot process for the hydrolysis and hydrogenation of inulin to sorbitol and mannitol has been achieved with Ru/C catalysts where the carbon support was preoxidized to generate acidic sites [69]. Ribeiro and Schuchardt [70] have succeeded in converting fructose into furan-2,5-dicarboxylic acid with 99% selectivity at 72% conversion in a one-pot reaction... 

In the presence of MCM-41, acidic Mordenites and Beta zeolites with different Si/Al ratios, it has been shown by Abbadi et al 111 that maltose (lg in 50 ml of water, batch reactor, 0.5g of catalyst) was also selectively hydrolysed into glucose at 130°C. For other polysaccharides, such as amylose and starch, the conversion and... 

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